30 And he brought them out and said, “Sirs, what must I do to be saved?” 31 So they said, “Believe on the Lord Jesus Christ, and you will be saved, you and your household.” 32 Then they spoke the word of the Lord to him and to all who were in his house. 33 And he took them the same hour of the night and washed their stripes. And immediately he and all his family were baptized. 34 Now when he had brought them into his house, he set food before them; and he rejoiced, having believed in God with all his household. (Acts 16:30-34)
Too many people stop at verse 31 when telling the lost how to be saved. Clearly, one must “believe on the Lord Jesus Christ” to be saved. But since “even demons believe–and tremble”, there must be something more to believing than mental assent (James 2:19). Verse 34 says the jailer and his house “rejoiced, having believed in God”. So, how to “believe on the Lord Jesus Christ” is found in verses 32-33. Faith was produced by hearing the word of God (v. 32; Romans 10:17). Repentance is implied in the washing of the stripes that were faithlessly applied and ignored (vss. 33, 23). With believing repentance they were immediately baptized (v. 33). After hearing, believing, repenting and being baptized came the rejoicing of salvation; now they “believed in God” (v. 34).